CVE-2026-98601Bluetooth: btintel_pcie: validate device-supplied DMA indices

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel_pcie: validate device-supplied DMA indices In btintel_pcie_msix_rx_handle(), the driver processes RX completion descriptors (urbd1) written by the PCIe device into DMA-coherent memory. urbd1->frbd_tag (a 16-bit field fully controlled by the device firmware via DMA) is used directly as an array index into rxq->bufs[] without any bounds check. rxq->bufs[] has only BTINTEL_PCIE_RX_DESCS_COUNT (64) entries, while frbd_tag can be any value 0-65535. A malicious or malfunctioning device can write an out-of-range frbd_tag, causing the driver to dereference an out-of-bounds data_buf pointer. Additionally, cr_hia is read from a DMA-shared index array also writable by the device; if the device sets cr_hia >= rxq->count, the while-loop never terminates because cr_tia is wrapped via modulo rxq->count and can never equal an out-of-range cr_hia. Add bounds validation for cr_hia and frbd_tag in the RX path, and cr_hia in the TX path. Log invalid values with bt_dev_err before returning.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/f42cd95e679d5b78611cd2208cd1c41ad0045ffa
• https://git.kernel.org/stable/c/8ec5838a35b03ac0cf3602452a369898051ffaf9
• https://git.kernel.org/stable/c/b29b70bfa12133423924fcd0327c19a802f7e368
• https://git.kernel.org/stable/c/37a11129345337efd6eef8e62b03b6348cd0dd8b